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Pruning The ELM Survey: Characterizing Candidate Low-Mass White Dwarfs Through Photometric Variability
Keaton J. Bell, A. Gianninas, J. J. Hermes +7
We assess the photometric variability of nine stars with spectroscopic Teff and log(g) values from the ELM Survey that locate them near the empirical extremely low-mass (ELM) white…
A Deep Proper Motion Catalog Within the Sloan Digital Sky Survey Footprint. II. The White Dwarf Luminosity Function
Jeffrey A. Munn, Hugh C. Harris, Ted von Hippel +8
A catalog of 8472 white dwarf (WD) candidates is presented, selected using reduced proper motions from the deep proper motion catalog of Munn et al. 2014. Candidates are selected i…
New Halo White Dwarf Candidates in the Sloan Digital Sky Survey
Kyra Dame, A. Gianninas, Mukremin Kilic +5
We present optical spectroscopy and near-infrared photometry of 57 faint () high proper motion white dwarfs identified through repeat imaging of square degr…
Today a Duo, But Once a Trio? The Double White Dwarf HS 22202146 May Be A Post-Blue Straggler Binary
Jeff J. Andrews, Marcel Agüeros, Warren R. Brown +4
For sufficiently wide orbital separations {\it a}, the two members of a stellar binary evolve independently. This implies that in a wide double white dwarf (DWD), the more massive…
Massive Double White Dwarfs and the AM CVn Birthrate
Mukremin Kilic, Warren R. Brown, Craig O. Heinke +3
We present Chandra and Swift X-ray observations of four extremely low-mass (ELM) white dwarfs with massive companions. We place stringent limits on X-ray emission from all four sys…
Discovery of Three Pulsating, Mixed-atmosphere, Extremely Low-mass White Dwarf Precursors
A. Gianninas, Brandon Curd, G. Fontaine +2
We report the discovery of pulsations in three mixed-atmosphere, extremely low-mass white dwarf (ELM WD, M 0.3 M) precursors. Following the recent discoveries…